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14#define KMSG_COMPONENT "dasd"
15
16#include <linux/interrupt.h>
17#include <linux/fs.h>
18#include <linux/blkpg.h>
19
20#include <asm/uaccess.h>
21
22
23#define PRINTK_HEADER "dasd_gendisk:"
24
25#include "dasd_int.h"
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29
30int dasd_gendisk_alloc(struct dasd_block *block)
31{
32 struct gendisk *gdp;
33 struct dasd_device *base;
34 int len;
35
36
37 base = block->base;
38 if (base->devindex >= DASD_PER_MAJOR)
39 return -EBUSY;
40
41 gdp = alloc_disk(1 << DASD_PARTN_BITS);
42 if (!gdp)
43 return -ENOMEM;
44
45
46 gdp->major = DASD_MAJOR;
47 gdp->first_minor = base->devindex << DASD_PARTN_BITS;
48 gdp->fops = &dasd_device_operations;
49 gdp->driverfs_dev = &base->cdev->dev;
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58 len = sprintf(gdp->disk_name, "dasd");
59 if (base->devindex > 25) {
60 if (base->devindex > 701) {
61 if (base->devindex > 18277)
62 len += sprintf(gdp->disk_name + len, "%c",
63 'a'+(((base->devindex-18278)
64 /17576)%26));
65 len += sprintf(gdp->disk_name + len, "%c",
66 'a'+(((base->devindex-702)/676)%26));
67 }
68 len += sprintf(gdp->disk_name + len, "%c",
69 'a'+(((base->devindex-26)/26)%26));
70 }
71 len += sprintf(gdp->disk_name + len, "%c", 'a'+(base->devindex%26));
72
73 if (base->features & DASD_FEATURE_READONLY ||
74 test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
75 set_disk_ro(gdp, 1);
76 gdp->private_data = block;
77 gdp->queue = block->request_queue;
78 block->gdp = gdp;
79 set_capacity(block->gdp, 0);
80 add_disk(block->gdp);
81 return 0;
82}
83
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85
86
87void dasd_gendisk_free(struct dasd_block *block)
88{
89 if (block->gdp) {
90 del_gendisk(block->gdp);
91 block->gdp->queue = NULL;
92 block->gdp->private_data = NULL;
93 put_disk(block->gdp);
94 block->gdp = NULL;
95 }
96}
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100
101int dasd_scan_partitions(struct dasd_block *block)
102{
103 struct block_device *bdev;
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105 bdev = bdget_disk(block->gdp, 0);
106 if (!bdev || blkdev_get(bdev, FMODE_READ, NULL) < 0)
107 return -ENODEV;
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112 ioctl_by_bdev(bdev, BLKRRPART, 0);
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123 block->bdev = bdev;
124 return 0;
125}
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131void dasd_destroy_partitions(struct dasd_block *block)
132{
133
134 struct blkpg_partition bpart;
135 struct blkpg_ioctl_arg barg;
136 struct block_device *bdev;
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142 bdev = block->bdev;
143 block->bdev = NULL;
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150 memset(&bpart, 0, sizeof(struct blkpg_partition));
151 memset(&barg, 0, sizeof(struct blkpg_ioctl_arg));
152 barg.data = (void __force __user *) &bpart;
153 barg.op = BLKPG_DEL_PARTITION;
154 for (bpart.pno = block->gdp->minors - 1; bpart.pno > 0; bpart.pno--)
155 ioctl_by_bdev(bdev, BLKPG, (unsigned long) &barg);
156
157 invalidate_partition(block->gdp, 0);
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159 blkdev_put(bdev, FMODE_READ);
160 set_capacity(block->gdp, 0);
161}
162
163int dasd_gendisk_init(void)
164{
165 int rc;
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167
168 rc = register_blkdev(DASD_MAJOR, "dasd");
169 if (rc != 0) {
170 pr_warning("Registering the device driver with major number "
171 "%d failed\n", DASD_MAJOR);
172 return rc;
173 }
174 return 0;
175}
176
177void dasd_gendisk_exit(void)
178{
179 unregister_blkdev(DASD_MAJOR, "dasd");
180}
181